Use strptime and strftime :
In [1]: import datetime
In [2]: datetime.datetime.strptime('10/05/2012', '%d/%m/%Y').strftime('%Y-%m-%d')
Out[2]: '2012-05-10'
Similarly, in the syntax of a Django template, you can use a date filter :
{{ mydate|date:"Y-m-d" }}
to print the date in your preferred format.
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